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In an AP, (a_{17}=a_7+60) and (a_7=33). What is (a_{43})?

Answer and explanation

Correct answer: 249

In an AP, \(a_{17}-a_7=(17-7)d=10d\). Hence, \(10d=60\), so \(d=6\). Now, \(a_{43}=a_7+(43-7)d=33+36\times6=249\). Therefore, 249 is correct. Getting 255 would result from an incorrect term gap or common difference. Exam tip: the number of common differences between two terms equals the difference between their subscripts.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceClass 10 MathematicsAp CalculationsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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